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The Understanding Of Genetics (biology Only) (GCSE Biology)

The following is a GCSE Biology test covering 'The Understanding Of Genetics (biology Only)' from the broader topic Inheritance, Variation And Evolution. The test is geared towards the AQA exam board style syllabus.
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Two animals from the same species show different fur colour because of differences in their genes. This is an example of what type of variation?
What is meant by a “carrier” for a genetic disease?
Cystic fibrosis is caused by a recessive allele. If both parents are carriers (Ff), what is the probability a child will have cystic fibrosis?
Which observation would most strongly support the idea that two populations have become separate species?
Why is sexual reproduction important for evolution?
In humans, sex is determined by X and Y chromosomes. Which gamete from a father determines the genetic sex of the child?
What evidence from fossils most directly supports the theory of evolution by natural selection?
Why might a harmful recessive allele persist in a population at low frequency?
In a Punnett square cross between two heterozygous parents (Aa × Aa), what fraction of offspring will be homozygous recessive and show a recessive disorder?
Which statement best describes homologous structures found in the limbs of different vertebrates?
Which evolutionary outcome can result from isolation (geographic or reproductive) of subpopulations over many generations?